Hello. 
There is no virus in the trainer. This is called a false positive and they are extremely common with trainers, no matter where you get them from. They are triggered due to the way trainers work, which is by injecting cheats into your PC’s RAM. They are harmless.
Please use the search button in the future before posting what can be seen as false statements, as this is already covered elsewhere multiple times.
For example, this thread explains why it happens and how to resolve it: Windows Defender marked WeMod as a Trojan - #2 by Ravenfyre.
Thank you